The act of spreading ones ass cheeks and touching the petri anal area to the surface of another persons body.
"Damn Joel, why do you stink?" "I got brown buttoned last night"
by Richard Lapointe December 13, 2003
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The anus. The oring. The bung hole. The balloon knot. The lid to the fart box.
I was tongue punching her brown button last night.

Her brown button was ripe and musky.

I’m sorry babe. It was dark. I couldn’t see. I swear I didn’t intend to poke your brown button.
by Eaton Holgoode October 30, 2018
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The act of forcibly sticking a nipple up someone's rectum.
"Hold em down Skeeter, I'm gonna give him a brown button!"
by WizardofAss June 2, 2016
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an asshole that hasnt been wahsed or cleaned for 7-10 years
fuk kid, i was gon score this hoooot ass, when i saw she had a rusty brown button!!!!
by sackcrusher9 October 11, 2006
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